Can I use regular baking soda like I see in the grocery store?

No. While all baking soda is chemically the same (NAHCO3) only ARMEX is formulated for use as a blast media and only ARMEX is manufactured by ARM & HAMMER®. Formulations contain uniform particle sizes from 70-270 microns, and ingredients for flowability and rinsabilty. The profile formulas are uniquely blended for more aggressive removal applications.